workload evacuate action

Registered by suzhengwei

Sometimes if the failure has happened to one compute node, it would be
marked as down. Then we need to evacuate the instances which are running
on this failure compute node.

It needs to do following things:
* add an action to evacuate all the instances of the failure compute node
* add a strategy which will trigger the evacuate action

Now watcher need an action, which is executed to evacuate the instances of the failure compute node.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
suzhengwei
Direction:
Needs approval
Assignee:
suzhengwei
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Alexander Chadin

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